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It can depend on what kind of flickering you are seeing. A very very fast one, that shows more obvious if you look to the side of your screen (instead of directly at it as normal), means your screens 'refresh rate' is most likely wrong.
That's the most likely problem you have, as the inverter will usualy only make a screen flash, not flicker, though they don't usually flash too much before the bulb or inverter can't take the strain and breaks properly.
Sometimes a screens circuit can go slightly faulty (very rare) and cause a slight change in its refresh cycle, and that can cause a high speed flickering too, usually accompanied with a very slight blurring of any images.
The standard setting for a C400 is 1024 x 768 resolution at 60 Hertz, so check your display properties to see that's not been accidentally changed.
http://www.user-guides.co.uk/cddownload/Dell/DellLatitude/Dell-Latitude-C400-XP-Driver-Recovery-CD-Restore-Disk-1420.html at this location you will find and be able to download an cd in image format ..probably ISO ..you have to burn it on a cd ..and use it al the time you reinstall ..I understood that there are all the drivers you need for your model Good luck!